Perhaps, but isn't there the risk that a charismatic leader could get team members to essentially do the work for him/her? There were charismatic students who

Perhaps, but isn't there the risk that a charismatic leader could get team members to essentially do the work for him/her? There were charismatic students who tried that, but it would become apparently very quickly what was happening and that point our competitiveness would kick in and we would demand contributions from that person before we would assist any further. But yes, there is always someone who will abuse the system, and you're not going to get far trying to achieve 100% compliance all the time.